EMC2104 datasheet(81/101 Pages) SMSC

81 / 101 page

Dual RPM-Based PWM Fan Controller with Hardware Thermal Shutdown

Datasheet

SMSC EMC2104

Revision 1.74 (05-08-08)

DATASHEET

6.39

GPIO Output Register

The GPIO Output Register controls the state of the corresponding GPIO pins when they areconfigured

as GPIOs and as outputs.

If the output is configured as an open-drain output, then it requires a pull-up resistor to VDD. Setting

the corresponding bit to a ‘1’ will act to disable the output allowing the pull-up resistor to pull the output

high. Setting the corresponding bit to a ‘0’ will enable the output and drive the pin to a logical ‘0’ state.

If the output is configured as a push-pull output, then output pin will immediately be driven to match

the corresponding bit setting.

6.40

GPIO Interrupt Enable Register

The GPIO Interrupt Enable Register enables the GPIOs to assert the ALERT pin when they change

state. When the GPIO pins are disabled or configured as outputs, then these bits are ignored.

Bit 3 - 0 - GPIOx_INT_EN - Allows the ALERT# pin to be asserted when the GPIOx pin changes state

(when configured as an input).

‘0’ (default) - The ALERT# pin will not be asserted when the GPIOx pin changes state (when

configured as an input).

‘1’ - The ALERT# pin will be asserted when the GPIOxpin changes state (when configured as an

input).

6.41

GPIO Status Register

The GPIO Status Register indicates which GPIO has changed states to cause the ALERT pins to be

asserted. This register is cleared when it is read. The bits in this register are set whenever the

corresponding GPIO changes states regardless if the ALERT pins are asserted. Once a bit is set, it

will remain set until read.

Table 6.56 GPIO Output Register

ADDR

R/W

DEFAULT

E4h

R/W

GPIO

Output 1

GPIO3

_OUT

GPIO2

_OUT

GPIO1

_OUT

00h

Table 6.57 GPIO Interrupt Enable Register

ADDR

R/W

DEFAULT

E5h

R/W

GPIO

Interrupt

Enable

GPIO3_

INT_EN

GPIO2_

INT_EN

GPIO1_

INT_EN

00h

Table 6.58 GPIO Status Register

ADDR

R/W

DEFAULT

E6h

R-C

GPIO

Status

GPIO3_

STS

GPIO2_

STS

GPIO1_

STS

00h

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